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Properly dispose ImagePanels

src/com/jpexs/decompiler/flash/easygui/EasyPanel.java

@@ -19,6 +19,7 @@ package com.jpexs.decompiler.flash.easygui;
 import com.jpexs.decompiler.flash.SWF;
 import com.jpexs.decompiler.flash.gui.View;
 import java.awt.BorderLayout;
+import java.util.ArrayList;
 import java.util.List;
 import javax.swing.JPanel;
 
@@ -57,4 +58,9 @@ public class EasyPanel extends JPanel {
     public SWF getSwf() {
         return tabSwitcher.getSelectedValue();
     }
+    
+    public void dispose() {
+        setSwfs(new ArrayList<>());
+        easySwfPanel.dispose();
+    }
 }